Working the die hole contour of a wire drawing die



9 1 i w. RYBlcKI 2,452,15

WORKING THE DIE HOLE CONTOUR OF A WIRE DRAWING DIE Filed July 7, 1945WQLEE @757 Patented o r. 26, 1948 UNITED STATES PATENT. OFFICE WORKINGTHE DIE HOLE CONTOUR OF A WIRE DRAWING DIE Walter Ryblckl, GarfieldHeights, Ohio Application July 7, 1945, Serial No. 603,673

' 2 Claims. (Cl. 51-67) This invention relates to working the die holecontour of a wire drawing die; polishing the entrance angle, orsmoothing out section, providing an example of such working; and has theadvantages that it provides for repeatedly doing this work in the caseof a large number of dies so as to get substantially identical resultseven when done by a relatively unskilled worker.

A specific example of the invention is illustrated by the accompanyingdrawings, in which:

Figure 1 is a front view of this exemplary machine at work on a wiredrawing die;

Figure 2 is a longitudinal section of'the die showing the section of itsdie hole contour that is being worked and the relation of the workingtool thereto as this tool is being inserted into the hole; and

Figure 3 is an end view of a detail of Figure 1, partially in crosssection.

More specifically, these drawings show this illustrated machine asincluding means i for.

holding and rotating a wire drawing die 2 about its axis in a tiltedposition, a spindle 3 having an end 4 for rigidly mounting a tool 5 forworking the die hole contour of the die 2, and a reciprocating surface 6spaced opposite the face of the die 2 at an elevation holding thespindle 3 tilted when the tool 5 is mounted by the end 4 and is restingin the die hole of the die 2 and the spindle 3 is resting on the surface6. The arrangement of these parts is such that the tool and spindle havea common axis which is aligned with the die hole axis, while the surface8 frictionally restrains the spindle against rotatingwith the die whileproviding the spindle with africtional reciprocating drive.

The die 2 is a tungsten carbide die of the usual type having a steelcase mounting the tungsten carbide nib in which the die hole is formed,and having a cylindrical exterior concentric with the die hole axis. Themeans i is a releasable chuck of the self-centering type familiar tomachinists and mounted by one end of a rotative shaft 1 journaled by atilting frame 8 provided with means 9' for adjusting and fixing itsdegree of tilt, this means 9 being of any suitable form and thus makingit unnecessary to describe the one specifically shown. The surface 6comprises a length of flexible material in bent around a wheel I Irotatively journaled by the frame 8 at right angles to the shaft 1, oneend of this length l0 being connected with a rotative crank arm l2 andits other end being tensioned by spring means l3. Leather provides agood example of the material from which the length it may be mumpressure of the tool on the die hole contour against which it isworking, is either too light or too heavy. With this understood it isnow appropriate to describe the operation of the machine.

A die to be polished is placed in the chuck I and the latter tightened,this automatically centering the die hole axis relative the rotativeaxis of the shaft 1. This shaft I may then be rotatively powered, as byapplying belt power to the pulley l4 shown on its other end from thatmounting the chuck l. The rotative speed may be in the order of thatcommonly used in the case-of the manual method. At this time, rotationof the crank arm l2 causes reciprocation of the surface 6, the crank arm12 being shown as provided with a rotative crank shaft i5 having apulley IS on its end remote from the crank arm l2 and rotatively drivenby a belt powered by a pulley l1 fixed on the shaft 1 right next thepulley I4 and so driven by the latter. The crank arm 12 is shown ashaving an adjustable throw, any arrangement effecting this beingsuitable and it being therefore unnecessary to specifically describe theone shown, and this arm should be adjusted so that the reciprocatingstroke of the surface 6 is appropriate to work the entrance angle, orsmoothing out section, of the die hole contour with the tool 5. Now,with the die rotating and the surface 6 reciprocating, the reciprocatingdirection of course being axially of the die hole of the die, andasuming that the spindle 3 has the tool 5 fixed in its chuck 4, the nextstep is to apply the abrasive, insert the end of the tool 5 lightly intothe die "hole and lay the spindle tangentially onto the surface 6, thesurface 6 frictionally supporting and reciprocating the spindle 3 sothat the latter reciprocates the tool 5 in the die hole and polishes itscontour, this surface also frictionally restraining rotation of thespindle and hence-of the tool, at this time. The pulley H is providedwith flanges Ila, both for the purpose of providing lateral stabilityfor the spindle 3 and to keep the length iii in position,

3 it therefore being convenient to rest the spindle 3 on the surface asdescribed. Further security may be obtained by means of the illustratedreleasable clip la. The spindle is unsupported vertically, exceptingthat it fulcrums on the surface 6 with its tool resting on the die holecontour because of the weight of the spindle, chuck and tool and thetilt of the parts.

It can be seen that the above involves a new method of polishing thecontour of a wire drawing die which may be carried out manually or bymachines other than the one specifically disclosed here. This methodincludes holding the wire drawing die in a tilted position with a toolresting in its die hole and held by a tilted spindle fulcrumed remotelyfrom the die, the fulcrum being on the surface 8 in the case of theillustrated machine as has been described, and with the spindleotherwise free from vertical support, while causing relative rotationand reciprocation between the die and the tool.

The foregoing has the great advantage that the maximum pressure that canbe exerted by the tool against the die hole contour has a positiveconstant value fixed by the weight of the spindle 3, the chuck 4 and,while relatively inconsiderable, the weight of the tool 5, and by thetilt of the die and the spindle. In the case of the illustrated machine,if the frame 8 is given the proper tilt, and the spindle, chuck and toolthe proper weight, all to provide the proper maximum working pressure ofthe tool 5 against the die hole contour, then this pressure remainsconstant regardless of the number of dies that may be polished.

Since the tilt of the parts is primarily needed to assure a forwardfeeding tendency and prevent the tool from falling out of the die holeby working backwardly more than forwardlyas it is reciprocated by thespindle 3 resting on the reciprocating surface 6, and since it hascomparatively little effect on the tool working pressure as compared tothe weight of the spindle, it maybe preferable to provide a fixed tiltto the frame 8 and to dispense with the adjustable means 9, since thisprevents tampering by the worker. If the worker is given the spindle 3with its chuck 4 and the tool 5, all having a total weight appropriatefor the size of the die and the particular operation being carried out,then there is no chance for any serious mistakes. If the adjustablecrank arm i2 is set so that the stroke of the reciprocating surface 6 istoo great, this is immediately detectable because the tool falls out ofthe die hole, and if the stroke is too short proper polishing is noteffected. However, it may also be desirable to fix the throw of thecrank arm positively to prevent its being tampered with.

' The spindle 3 is illustrated as having a square cross section toenhance its resistance to rotation afforded by its resting frictionallyon the surface Hi. In many instances, it may be more desirable to givethis spindlea circular cross section so that while it is frictionallyrestrained by the surface it! against rotation, it can more easily turnagainst this restraint if the tool receives excessive torque, or so itmay turn slightly at each forward reciprocation to provide fordistribution of the abrasive polishing paste. Other shapes may be givenit, as required.

I claim:

1. A machine including means for holding and rotating a wire drawing dieabout its axis in a tilted position, a spindle having an end formounting a tool for working the die hole contour of said die, and areciprocating surface spaced opposite the face of said die at .anelevation holding said spindle tilted when said tool is mounted by saidend and is resting in said die hole and said spindle is resting on saidsurface, said means comprising a rotative shaft mounting a chuck on oneend for releasably holding said die and journaled by a tilting frameprovided with means for fixing its degree of tilt, and said surfacecomprising a length of flexible material bent around a wheel rotativelyjournaled by said frame at right angles to said shaft with one end ofsaid length connected with a rotative crank arm and its other endtensioned by spring means, said wheel being positioned so that when saidspindle is resting tangentially on said length bent therearound saidspindle is held as described.

2. A machine including means for holding and rotating a wire drawing dieabout its axis in a tilted position, a spindle having an end formounting a tool for working the die hole contour of said die, areciprocating surface spaced opposite the face of said die at anelevation holding said spindle tilted when said tool is mounted by saidend and is resting in said die hole and said spindle is resting on saidsurface, said surface comprising a length of flexible material bentaround a wheel rotatively journaled by said frame at right angles tosaid spindle, and means for reciprocating said length of flexiblematerial, said wheel being positioned so that when said spindle isresting tangentially on said length bent therearound said spindle isheld as described.

WALTER RY'BICKI.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 911,210 Conradson Feb. 2, 1909FOREIGN PATENTS Number Country Date 527,000 Germany June 12, 1931

